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State highway officials say new tests prove that Green Bay's troubled Leo Frigo Memorial Bridge remains on solid ground, despite records showing that few of the bridge's original underground support beams were driven down to bedrock.

Newly released records of the bridge's construction in the 1970s show that out of nearly 2,000 vertical steel beams, fewer than 10 percent reached sturdy limestone bedrock, as recommended in early design plans.

That has prompted some outside experts to question whether shifting underground soil conditions could explain the bridge's sagging condition, ...